Commit 56776695 authored by Jakub Kicinski's avatar Jakub Kicinski
Browse files

selftests: net: add test case for NAT46 looping back dst 



Simple test for crash involving multicast loopback and stale dst.
Reuse exising NAT46 program.

Reviewed-by: default avatarWillem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20250610001245.1981782-2-kuba@kernel.org


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent ba9db6f9

tools/testing/selftests/net/Makefile

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Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ TEST_PROGS += amt.sh 
TEST_PROGS += unicast_extensions.sh

TEST_PROGS += udpgro_fwd.sh

TEST_PROGS += udpgro_frglist.sh

TEST_PROGS += nat6to4.sh

TEST_PROGS += veth.sh

TEST_PROGS += ioam6.sh

TEST_PROGS += gro.sh

tools/testing/selftests/net/nat6to4.sh

0 → 100755
+15 −0
Original line number Diff line number Diff line 
#!/bin/bash

# SPDX-License-Identifier: GPL-2.0



NS="ns-peer-$(mktemp -u XXXXXX)"



ip netns add "${NS}"

ip -netns "${NS}" link set lo up

ip -netns "${NS}" route add default via 127.0.0.2 dev lo



tc -n "${NS}" qdisc add dev lo ingress

tc -n "${NS}" filter add dev lo ingress prio 4 protocol ip \

   bpf object-file nat6to4.bpf.o section schedcls/egress4/snat4 direct-action



ip netns exec "${NS}" \

   bash -c 'echo 012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789abc | socat - UDP4-DATAGRAM:224.1.0.1:6666,ip-multicast-loop=1'